When you start from a given set of rules and conditions and determine what must be true you are reasoning?

When you start from a given set of rules and conditions to determine what must be true, you are engaging in deductive reasoning. This process involves applying logical principles to derive conclusions that necessarily follow from the initial premises. Deductive reasoning ensures that if the premises are true, the conclusions drawn are also true. It is a fundamental method in fields such as mathematics, philosophy, and formal logic.